"When Supernatural Battles Became Commonplace" Light Novel Series Concludes in January
After nearly six years of publication, When Supernatural Battles Became Commonplace (aka Inou-Battle in the Usually Daze.), a fantasy light novel series written by Kota Nozomi and illustrated by 029 about a group of high school kids who spontaneously develop incredible super powers, is drawing to a conclusion with the publication of its 13th and final volume on January 13, 2018.
— アニメ「異能バトルは日常系のなかで」公式 (@inou_PR) December 7, 2017
The When Supernatural Battles Became Commonplace novels are published in Japan by SB Creative under their GA Bunko imprint. The 1st volume was released in June of 2012, and the series was also adapted into a 2014 TV anime with direction by Masahiko Otsuka and Masanori Takahashi and animation by Trigger.
Crunchyroll describes the story of the When Supernatural Battles Became Commonplace TV anime as follows:
A group of five boys and girls suddenly acquire supernatural powers. Ready to fight in galactic battles to defend human cause… they are struck by the realization that there are no wars, no conspiracies, no evils empires, no nothing in their high school life. They instead decide to idly have fun by wasting their powers away.